alleryએક વર્તુળાકાર વલય 21 cm અને 14 cm ત્રિજ્યા ધરાવતા વર્તુળોથી ઘેરાયેલું છે. તેનું ક્ષેત્રફળ શોધો (pi = 22/7).
A1078 cm²
B770 cm²
C308 cm²
D462 cm²
Answer & Solution
Correct answer: B. 770 cm²
ક્ષેત્રફળ = π(21² - 14²) = (22/7)(245) = 770 ચોરસ સેન્ટિમીટર.
Keep practising Geometry & Mensuration
Browse all Geometry & Mensuration questions for RRB NTPC, or explore more Quantitative Aptitude topics.
Related questions
In three dimensions, what formula gives the volume inside a sphere of radius r?Which algebraic expression calculates the total exterior area bounding a sphere of radius For a circular cylinder of base radius r and height h, which formula gives its volume?Which formula gives the curved side area of a right cylinder with radius r and height h?What geometric solid is generated by rotating a rectangle about one of its sides?What is the longest line segment that can be drawn between two points on a sphere?What metric area corresponds to one million square metres?How many square centimetres are contained in one square metre?